for Peg1 users with a USB pci card : if you experience slowness, freezes, and other bad behaviour in MOS 2.0, just remove your usb card from the peg. Then the system gets stable and fast again. Some other peg1 users confirmed it (with VIA cards)
I tried a Nec USB2 card a few daus ago but the peg1 wouldn't even boot with it.

The USB driver in MOS 2.0 sucks IMHO. I'm waiting for an update.